27
LG 27 Error Code – PSC Fault Error
Air Conditioner · CRITICAL Severity
What This Error Means
Prospective short circuit fault; current to inverter compressor too high
Diagnostic & Repair Steps
1
Power Off Immediately
PSC fault indicates dangerous overcurrent.
PSC fault indicates dangerous overcurrent.
RESET
~2 min
2
Inspect Outdoor PCB
Check for burn marks near converter circuit. ⚠️ Disconnect and wait 10 min
Check for burn marks near converter circuit. ⚠️ Disconnect and wait 10 min
INSPECT
~15 min
3
Check Compressor Windings
Measure for short circuit.
Measure for short circuit.
TEST
~20 min
4
Check Refrigerant Charge
Incorrect charge can cause high current. ⚠️ Certified technician only
Incorrect charge can cause high current. ⚠️ Certified technician only
TEST
~20 min
5
Refer to LG Service Manual
Visit www.lg-dfs.com for detailed troubleshooting.
Visit www.lg-dfs.com for detailed troubleshooting.
CHECK
~10 min
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